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Q: In which of the following staircase classifications is the stair slab supported parallel to the riser at two or more locations, causing the slab to bend longitudinally between the supports?
  • A. Slab cantilevered from a spandrel beam or wall
  • B. Stair slab spanning longitudinally
  • C. Slab supported between two stringer beams or walls
  • D. Slab doubly cantilevered from a central spine beam
Correct Answer: Option B - Structural system of stair slab– 1. Stair slab spanning horizontally 2. Stair slab spanning longitudinally–The waist slab of a stair slab spanning longitudinally (viz. parallel to flight or riser) may act simply supported or complete fixed or partially fixed at the support. It is depending upon the fixity from the supports. Sometimes, instead of a waist slab, only step are kept cantilevered from a wall edge beam from one side. Many times, the steps are cantilevered on both sides from a middle stringer beam. Such system of stairs are referred as stairway.
B. Structural system of stair slab– 1. Stair slab spanning horizontally 2. Stair slab spanning longitudinally–The waist slab of a stair slab spanning longitudinally (viz. parallel to flight or riser) may act simply supported or complete fixed or partially fixed at the support. It is depending upon the fixity from the supports. Sometimes, instead of a waist slab, only step are kept cantilevered from a wall edge beam from one side. Many times, the steps are cantilevered on both sides from a middle stringer beam. Such system of stairs are referred as stairway.

Explanations:

Structural system of stair slab– 1. Stair slab spanning horizontally 2. Stair slab spanning longitudinally–The waist slab of a stair slab spanning longitudinally (viz. parallel to flight or riser) may act simply supported or complete fixed or partially fixed at the support. It is depending upon the fixity from the supports. Sometimes, instead of a waist slab, only step are kept cantilevered from a wall edge beam from one side. Many times, the steps are cantilevered on both sides from a middle stringer beam. Such system of stairs are referred as stairway.